Update nested array object value by replacing substring of that object property - arrays

Question

I have the following set of data in my MongoDB collection called orders:
{
"_id" : ObjectId("618e0e1b17687316dcdd6246"),
"groupUID": "abc",
"orderData" : {
"charges" : {
"total" : 18480.0,
"subtotal" : 13980.0
},
"items" : [
{
"name" : "Chocolate cookies",
"imageURL": "domainURL2.com/cookies"
},
{
"name" : "Chocolate muffins",
"imageURL": "domainURL2.com/muffins"
}
]
}
}
Now I want to update the imageURL substring part of "domainURL2" to "domainURL1" field in every document of this collection. I have the following query so far:
db.orders.update(
{
"groupUID" : "abc"
},
{ "$set": { "orderData.items.$.imageURL":"myURL.com" } } )
I also have the query in JavaScript form but I want this to be in pure Mongo query. So the query below will not do it for me unfortunately.
db.getCollection("orders").find({"groupUID" : "abc"}).forEach(function(aRow) {
if (aRow.orderDetails !== undefined) {
var updated = false;
aRow.orderData.items.forEach(function(item) {
item.imageURL = item.imageURL.replace("eddress/", "noknok-app/");
})
db.getCollection("orders").save(aRow);
}
});
I want to update all records' imageURL field's substring part. I am unable to figure out the rest of the query. Can anyone please help me?

Answer 1

My answer may look complex (Welcome for suggestion/improvement).
Work the update with Aggegration Pipeline.
$set - Update orderData.items field.
1.1. $map - Iterate orderData.items and returns new array.
1.1.1. $mergeObjects - Merge current object and imageURL field from 1.1.1.1.
1.1.1.1. $cond - With $regexMatch to find the imageURL starts with "domainURL2.com".
1.1.1.2. If true, then replace "domainURL2.com" with "domainURL1.com".
1.1.1.3. If false, remain existing value.
db.collection.update({
"groupUID": "abc"
},
[
{
"$set": {
"orderData.items": {
$map: {
input: "$orderData.items",
in: {
$mergeObjects: [
"$$this",
{
imageURL: {
$cond: {
if: {
$regexMatch: {
input: "$$this.imageURL",
regex: "^domainURL2.com"
}
},
then: {
$concat: [
"domainURL1.com",
{
$arrayElemAt: [
{
$split: [
"$$this.imageURL",
"domainURL2.com"
]
},
-1
]
}
]
},
else: "$$this.imageURL"
}
}
}
]
}
}
}
}
}
])
Sample Mongo Playground
Another approach is using $replaceOne (suggested by #rickhg12hs) which will be much easier.
$replaceOne to replace for 1.1.1.1.
db.collection.update({
"groupUID": "abc"
},
[
{
"$set": {
"orderData.items": {
$map: {
input: "$orderData.items",
in: {
$mergeObjects: [
"$$this",
{
imageURL: {
$replaceOne: {
input: "$$this.imageURL",
find: "domainURL2.com",
replacement: "domainURL1.com"
}
}
}
]
}
}
}
}
}
])
Sample Mongo Playground ($replaceOne)